Bicycle



FIG. 1 is a side elevational view of a bicycle showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a rear view thereof.

The portions of the bicycle shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a “bicycle”, as shown and described. 